.page {
  font-size: 20px;
  width: 600px;
  height: 400px;
}
.container {
  border: 1px dotted sandybrown;
  display: flex;
  height: 100%;
}
.nav {
  display: flex;
  flex-direction: column;
  width: 130px;
  border-right: 1px solid silver;
  box-sizing: border-box;
}
.link {
  height: 50px;
  text-align: center;
  line-height: 50px;
  border-bottom: 1px solid cornsilk;
}
.link:hover {
  background-color: beige;
}
.content {
  padding: 30px;
  flex: auto;
}
